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Blow molds with moving parts?

Blow molds with moving parts?

Blow molds with moving parts?

(OP)
In designing a case for a product for a client, I've noticed a couple of things about their existing design/case.

It seems to me the case could not have been properly blow-molded without the parison being partially inflated and then the mold clamped down upon it.  The parting line has some non-hollow areas that are fairly thick and it appears as though the mold clamped down to form these areas after partial inflation.

Can anyone fill me in on how this is typically done and controlled?  I'd like to make sure this new design isn't inadvertently requiring something that cannot be done.

A couple of details:  The material of the existing case is HDPE and I noticed a small hole in each half of the case (closes like clam-shell, molded-in hing parts, latches that hold halves together) that seems to have been formed with something hot--like a soldering iron.  Perhaps this is a vent of some sort (~.125" diameter).

 

Jeff Mowry
www.industrialdesignhaus.com
A people who value security over freedom will soon find they have neither.

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